161212015 has 16 divisors (see below), whose sum is σ = 201916800. Its totient is φ = 123407872.

The previous prime is 161211989. The next prime is 161212039. The reversal of 161212015 is 510212161.

It is a cyclic number.

It is not a de Polignac number, because 161212015 - 2⁷ = 161211887 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 161211983 and 161212001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11466 + ... + 21304.

It is an arithmetic number, because the mean of its divisors is an integer number (12619800).

Almost surely, 2^161212015 is an apocalyptic number.

161212015 is a deficient number, since it is larger than the sum of its proper divisors (40704785).

161212015 is a wasteful number, since it uses less digits than its factorization.

161212015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9986.

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 161212015 is about 12696.9293531940. The cubic root of 161212015 is about 544.2508743664.

Adding to 161212015 its reverse (510212161), we get a palindrome (671424176).

The spelling of 161212015 in words is "one hundred sixty-one million, two hundred twelve thousand, fifteen".